S-SERIES INSTRUMENTS5.Light bulbs are plug-in type and are serviceablefrom either front or rear of instrument cluster(Figures 10 and 11).Figure 10 Removing Bulb From Front of literFigure 11 Removing Bulb and Bulb SocketFrom Rear of ClusterFLEX-PRINTED CIRCUITOne component of instrument cluster which is integralwith cluster body itself is the flex-printed circuit. Thistough flexible plastic film is cemented to cluster body tosimplify instrument wiring (25 electrical connections arereplaced by one). However, if the need should arise forelectrical troubleshooting, individual circuits on theprinted circuit are easily checked. This is accomplishedwith cluster removed (Figure 12).Circuit TestingObtain low voltage (battery powered) test light or circuittester. Position test probes on a selected circuit in amanner similar to that shown in Figure 12. If test lightilluminates, circuit is unbroken, or if test light fails toilluminate circuit is broken. Check each circuit in turnand if a broken circuit is found, instrument cluster bodymust be replaced.Figure 12 Checked Printed Circuit ContinuityReplacementSince printed circuit is cemented to and integral withinstrument cluster body, the printed circuit and clusterbody are available for replacement as a completeassembly only. Where replacement is required, obtainnew instrument cluster body assembly and transfer allgauges and light bulbs from old cluster body to new.Individual parts of the instrument cluster, available forservice, are shown inFigure 13 - Component of Instrument ClusterCTS - 4140Y Page 5
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